In this paper, a system for automated real-time tracking of a figure skater moving on an ice rink by using PTZ cameras is
presented. This system is intended for support in training of skating, for example, as a tool for recording and evaluation
of his/her motion performances. In the processing procedure of the system, an ice rink region is extracted first from a
video image by region growing method, then one of hole components in the obtained rink region is extracted as a skater
region. If there exists no hole component, a skater region is estimated from horizontal and vertical intensity projections
of the rink region. Each camera is automatically panned and/or tilted so as to keep the skater region on almost the center
of the image, and also zoomed so as to keep the height of the skater region within an appropriate range. In the
experiments using 5 practical video images of skating, it was shown that the extraction rate of the skater region was
almost 90%, and tracking with camera control was successfully done for almost all of the cases used here.
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